TME-104P-CSR-LX800-R1V5.doc
Rev 1.5
28 (44)
3.18
PC/104 Bus Interface
The PC/104 bus is a modification of the industry standard (ISA) PC bus specified in IEEE P996. The
PC/104 bus has different mechanics than P966 to allow the stacking of modules. The main features
are:
•
Supports programmable extra wait state for ISA cycles
•
Supports I/O recovery time for back-to-back I/O cycles
The following table shows the pin assignment of the PC/104 connector.
Note:
-5 V on the PC/104 connector are not supported on this board.
PC/104 Bus Connector
Pin
A
B
1
IOCHCK GND
2
D7
RSTDRV
3
D6
+5V
see note
4
D5
IRQ9
5
D4
-5V
6
D3
DRQ2
7
D2
-12V
see note
Pin
D
C
8
D1
ENDXFER
0
GND GND
9
D0
+12V
1 MEMCS16 SBHE
10 IOCHRDY KEY
2 IOCS16
LA23
11 AEN
SMEMW
3 IRQ
LA22
12 A19
SMEMR
4 IRQ
LA21
13 A18
IOW
5 IRQ
LA20
14 A17
IOR
6 IRQ
LA19
15 A16
DACK3
7 IRQ
LA18
16 A15
DRQ3
8 DACK
LA17
17 A14
DACK1
9 DRQ
MEMR
18 A13
DRQ1
10 DACK
MEMW
19 A12
REFRESH
11 DRQ
SD8
20 A11
SYSCLK
12 DACK
SD9
21 A10
IRQ7
13 DRQ
SD10
22 A9
IRQ6
14 DACK
SD11
23 A8
IRQ5
15 DRQ
SD12
24 A7
IRQ4
16 +5V
SD13
25 A6
IRQ3
17 MASTER
SD14
26 A5
DACK2
18 GND
SD15
27 A4
TC
19
GND GND
28
A3
BALE
29
A2
+5V
30
A1
OSC
31
A0
GND
32
GND
GND